There's a reason that all the lily pipes fit Eheim tubing. It's because Eheim filters have been so reliable and so steadily purchased for so long that the accessory manufacturers have adapted to be compatible with them. Think about it, if you were going to design a car accessory, wouldn't you want it to fit in Toyota Camry and Corolla? Personally, I like the Eheim Classic series for simplicity and value, along with wide parts availability and a track record where it's common to hear they last a decade or more. They also hold a ton of whatever media you choose without wasted space. On the downside, the green tubing isn't for everyone.
The Oase Biotherms have a few nice features like heater option and pre-sponges that are easy to clean, if you want extra convenience at a higher price.
As to the Aquaclear HOB suggestion, with 5 of these running in our room, I can't still recommend them for two related reasons. 1- you need to turn them off each time you do a water change 2- when you plug them back in after a water change, they often don't restart. This requires dealing with the mess of removing them from the tank, carrying them to the sink, removing and cleaning the motor/impeller and then reassembling & refilling. Quite a nuisance. Plus, visually, many including me, would rather not see an HOB at the back of the tank.
Walking the tightrope of discus in a high tech planted tank.
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